.________.
   +------------------------  )_      | ----------+
   |     a l t a i r       ..___|   / |--..     x |-------------------------|
   |          ._____. .____|        /     | ._____.  .__._____              |
   |       .--|  /_  \|   //__          __|-|____  \//  |     \\            |
   |       |     \/       |(  |        | |     \/   |   |  \\__|          x |
   |       |__//|_____\\______|        | |__//______|__//___|     +---------+
   | x                        |        )                        x |      bNR
   |_____________________.    |________|        x |_______________|
                         |________________________|